Magnetic clutch.



H, W. RVENSHAW MAGNET@ GLUTH;

APPMGATIQN FILED MG. 2G, wm.

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' ii iii .ar i oisisioia Januar WiLLociil navnnsnavv, OFHANWELL, ENGLAND.

MAGNETIC CLUTCH.,

Specification of Letters Patent. lPZiQIIiIlJQl, difatti. Q55, lllll..

Application filed August 26, 1909. Serial No. 514,789.

Tol all whom' 'it may concern:

Be it knovvn that l, HENRY WILLOCK RAvnNsii'Aw, ol Rutland House, Hanwellf' clutches of that type in which the electron'iagnetic element consists of a single annular trough mounted upon a spider or the like, the said trough holding an annular ener gizing coil. ln clutches ol this type it usual to wind the eiiergizingcoil upon an insulatingl casing or bobbin. 4'lheemploynient ot' such a casing or bobbinmhowever has the disadvantage. in practice that if it be made of such a size as to lit tightly on tothe ring forming the inner limb ot the lll-shaped trough, as it should be, it is a very ditlicultinatter to get it slipped on to the said ring. This is especially so in the case of clutches oli' large diameter.

lhe object of the present invention is to obviate this drawback and4 l shall now proceed to describe iny invention with reference to the accompanying' drawing in which the ligure is a cross section of the annular` U-sliaped trough of a clutch ol the type iudicated above. .c

The clutch body is composed ol a spider 3 or the like, a flat, annular base 2, an inner annular llaiigel l and an outer removable annular llange el held against the flat annular base 2 by a screw 5 or the like. The annular flange l is tui-ned down to forni an annular shoulder 7.

New in order to place the Winding in the trough I proceed as follows. The outer flange a being removed, l first place on the inner base 2, al dat ring 8 of insulating inaterial and push this up against the bottom of the trough as shown, and ll then place a second flat ring 9, also of insulating niaterial, on the flange l so that its. outer face Yis flush with the shoulder l0. l now place over the turned down end of the llange la flat brass retaining ring 1l, the opening inr which is of such diameter as to instill: on to ythe turned down part, and then upset the metal from the corner l2 so as to lorin a ridge 13, which ridge holds the brass retaining ring ll in`position. The insulated Wire for the energizing coil now Wound on in the space 14C and the llange 4 is subsequently placed in position and secured by screws or the like, 5.

'lt desired a ring of insulating ii'iaterial may be placed on the limb l. f '.lfhe `flange l may be provided with an iii- Wardly projecting edge l5 which overhangs the outside edge of the brass retaining ring 1l, so that should the ring ll have been pressed outward at all by the winding it will. be forced back into its proper place when the flange -cl placed in position and the screws 5 are tightened up.

.ll claim: in annular trougli-sliaiied magnetic clutch, comprising the combination of the spider 3, the ilat annular base 5l connected thereto, an outer cylindrical tlangc, relativA ably mounted on and secured to the llatbase, and having ali-inwardly projecting edge thereon; an inner cylindrical flange; a retaininguing rigidly and permanently attached thereto and, held in" place by the inwardly projecting edge ol the outer flange, and an `electroniagnetic Windingin the trough, confined by the removable flange and the retaining ring, substantially as de scribed.

ln Witness whereof l have signed my naine to this specification in the presence of two subscribing Witnesses.

HENRY Wllilal@ lt AVElS'Slllill'. 

